code: def parse(self):
      return self.parser.parse(
          input=None, lexer=self.graph, debug=False, tracking=False
      )
  
file_path: nnabla/python/src/nnabla/utils/converter/nnabla/opt_parser.py
imports: from ply import yacc
  from .opt_graph import Token
label_desc: Use image node_id 2 for calling the OptimizerParser obj's underlying member method code with example usage: obj.parse() and returns: self